Steam boiler



C. B. LITTLE STEAM BOILER March 18, 1930;

Filed Jan. 26, 1928 2 Sheets-Sheet 1 Fir rill/1! I l// lL/II 11/CLARENCEB,

C. B. LITTLE STEAM BOILER March 18, 1930.

Filed Jan. 26, 1928 2 Sheets-Sheet 2 Jrvuonbu Old Form.

CLAREN E BJSITTQE, 74im-m QMZW;

I My Patented Mar. 18, 1930 CLARENCE B. LITTLE, OE DAYTON, OHIO,ASSIGNGR TO THE BBOVJ'NELL COLIPANY, F

DAYTON, 01-120, A CORPORATION OF OHIO STEAM BOILER Application filedJanuary 26, 1928. Serial'No. 249,617.

come together, whereby these sheets will be in effect homogeneous orcontinuous at the corners or angles of the water leg, the electricallywelded meeting edges being thus made to run together and unite to makethis portion of the inner wall contiguous.

One result of this structural coordination and union of the severalsheets at the offset portions, as stated, is that of adding strength andgreater certainty against leakage where the sheets of the inner wallcome together in the offset portion thereof.

Another result is that of reduction in the cost of forming the jointbetween such portions of the inner wall, my plan under which the unionis effected through the use of electric welding being less expensivethan the constructions heretofore employed for making a water tightconnection between the several sheets of the inner wall at the offsetpor- 0 tion, as will more fully appear hereinafteri These severalobjects are carried into practical effect in the manner and by the meanspresently to be stated.

In the accompanying drawings:

Figure 1 is a perspective view of a corner ofthe water leg of a steamboiler of any conventional type with my improved joint applied thereto.I

Figure 2 is a plan view of what is shown in Fig. 1 bringing outparticularly the mere line in the mitre joint between two adjacent innerwalls of the water leg.

Figure 3 is an inverted plan view of the same parts, showing them asthey appear 5 when viewed from the bottom upward,

bringing out the nature of the joint between two adjacent sheets of theinner wall.

Figure 4: is a sectional view taken on the line 4=4: of Figure 3, alsolooking upward, and showing the inner walls in section taken through theoffset or inclined portions of the inner wall. 1

Figure 5 is a similar view to Figure 1 showing the old method of makingthe joint between the adjacent edges of the sheets composing the innerwall of the water leg or lining of thefire box; a comparison with thenew joint my invention provides will'make plain the difference betweenthe old and the new.

In the drawings the numerals 1 and 2 indicate the outer wall of a steamboiler water leg, the numeral 1 indicating one sheet and the numeral 2another'sheet of the leg, such sheets being at right angles to. oneanother. A full water leg includes, of course, two additional outerwalls, but these I omit to simplify the illustration and the morereadily to show the joint between thesheets which constitute the innerwall of the water leg. The inner wall, as shown in Fig. 1, comprisescorresponding sheets 3 and 43 both of which are deflected at an angle atthe point 5 which 1 term the ofiset, so as to leave an intervening spacewhich is for the water and to close that space along the bottom portionsof the.

inner wall as indicated at. 7, Where the inner sheets are shown rivetedpermanently to the outer sheets. Spacers indicated at 8 are placedbetween the inner and outer walls to keep the sheets in their fixedseparated relation so as to leave the water space.

Coming now nearer to the feature of my invention it will be notedthatfiange 9 and the corresponding flangelO (of the sheet 4) joint. Thisjoint consists of positioning the meeting edges 13 and 16L of the offsetportions of the inner sheets, 3 and at, quite close together, say as anexample, one-eighth of an inch,

so that these edges will readily unite and disappear when fused by theoperation of elecare terminated at the point 12, so that the .tricwelding. Again, the sheets bordering the edges 18 and 14 are beveled, asindicated at- 15 and 16 in Figures 3 and a, so as to cause reducedthickness in the margins of the sheets as indicated at 17 and 18 inFigure hwhereby the edges the more readily fuse when the current isapplied. i

In Figure 4E I have exaggerated somewhat the thicknessof the sheets, thewidth of the beveledportions and the space between the meeting edges 13and 14, before the act of welding in order to more clearly show theconstruction. b

In Figure 2 I have shown the meeting edges by a single line 19 withoutindicating any space between the edges of the two sheets. When thesheets are positioned andconnected upwith the outer walls, preparatoryto the welding operation, their meeting edges along the offset portionswill be as stated, approximately one-eighth of an inch, so that when thefusing operation occurs by the application of the electric current,these edges will unit by the flow of the metal; and this o-perationisaided by the beveling of the adjacent margins ofthe sheets, as abovestated. In order to more clearly define the Zone constituted of theunion of the sheets, I have shown in Fig. 3

the space between the lines 15 and 16 shaded with short cross-lines.

Theseremarlrs refer tothe appearance of the union of the sheets lookingat the bottom or loWer sides of the offset portions as shown 'inFig, 1and Fig. 3.

. Looking down upon the upper side of the offset portlons as in F 1g.2,a line 19 appears I ,to indicate where the mere, joint formerly was, butwhere now after the electric Welding operation the joint as a joint hasdisappeared and thesheets are in union. ,The zone of the union is,therefore, narrower on that 7 part of the offset portions of the innersheets which is next to the water in the water leg, while the'zone ofthe union as it appears next tothe fire box or on the inner face of theoffset portions is wider, due tov the flow of the metal having beenessentially produced on that face of the: margins of the sheets asindicated by thebeveled portions 15 and 16.

irnd it will be observed atthis point, by reference to F igQ 5, wherethe old form of construction is shown, that I have entirely tegrality ofthe meeting edges of the onset portions of the inner sheets. i

All danger of leaksat this point is eliminated. The joint is permanent,as muchrso as any part of the sheets because of the perfect fusing ofthe mar inal edges; and in this sense I have made a homogeneous jointwhere before there was only an overlapping of the parts held down byrivets.

I regard myself as the firstto makea homogeneous or integral union ofthe adjacent marginal edges of the innersheets or wall of a boiler firebox; and particularly the first to accomplish this by means of anelectric welding together of the adjacent marginal edges of the oifsetportions of theinner sheets. 7 r I I desire to comprehend within myinvention such modifications as may be clearly embraced within my claimand the scope ofmy invention. 1 I

Having thus fully describedjmy invention what I claim as new anddesireto secure by LettersPatent, is:

In a boiler water leg, a pair of rectangular sheets of metal, saidsheets being united at right angles to each other alongparts of one-CLARENCE B. LITTLE;

done away with the lower part, indicated at a, I

of the overlapping portion of the inner sheets as indicated at- 20 and21, as also the rivet or rivets, as the case may be, which formerly wereused in uniting the-lower portions of these overlapping parts 20 and 21to each other and to the outer sheets of the water leg.

My joint here. described is more quickly made than was the oldjointherereferred to, and with less expense, and is more effectivein that asdistinguished from parts that are merely overlapped and riveted downtogether, in myjoint there is effected an in

